No access to free/booked times

Riedel, Max 45 Reputation points

Hello everyone,

An employee contacted our IT department today. He has the following problem:

In our organization, each calendar is set so that everyone in our organization can see the free/booked times.

In Powershell it is displayed as: User: Standard (i think in english it is Default) hast the AccessRigths AvailabilityOnly

As far as I know, this is the default configuration.

However, this one employee has the problem that he cannot see the free/booked times via his Outlook 365 for almost every user. He has no problems via the browser (OWA) or the new Outlook 365 and can see the free/busy times.

Mailboxes where he has full access or calendars where he has been given separate authorizations can also be accessed with the "old" Outlook 365.

When the employee opens a calendar, it says "updating" for a very long time. At some point it then says "no connection". It doesn't matter whether the cache mode is activated or deactivated.

We have also excluded our firewall by connecting the client to Exchange Online via hotspot.

I don't have this problem with my client and my Outlook 365. If this employee logs on to my client with his user, he has the same problem. I therefore assume that it is not due to the employee's Outlook 365.

According to the M365 admin status, there is currently no problem with this.

Does anyone else have the same problem or does anyone know what the solution is for this?

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12 answers

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  1. Benjamin Biessmann 15 Reputation points

    Microsoft finally confirmed an issue in the services health.

    EX744850: "Some users may be unable to leverage Outlook add-ins or view Calendar free/busy information"

    2 people found this answer helpful.

  2. Nienhaus, Frank 11 Reputation points

    We're experiencing a similar temporary issue for our users. Additionally, we're encountering problems with our signature solution, Exclaimer. I suspect it might be related to the same error outlined here:

    If our signatures aren't loading, we're also experiencing issues with the calendar and elsewhere.

    Are all of you based in Germany?

    Best regards,


    1 person found this answer helpful.

  3. Riedel, Max 45 Reputation points

    The employee with the problem still has the problem.

    I ran the test with him today on the test client. As I reported before, it worked for a short time on the test client. However, it did not work again today on the same device.

    This means that I do not assume that it is related to the device or the Office version, but is a global error at Microsoft. I created a ticket about this last week. Unfortunately, the support quality is not the best and the colleague was unable to help and moved the ticket to another department. I am waiting for feedback and will report back when I have news.

    Best regards,

    1 person found this answer helpful.
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  4. Marcel Strehlow 5 Reputation points

    Since last thursday the issue described here is occuring in our organisation (location: Germany). Just randomly the view on colleagues' calendars is updating and it stops working shortly later. View on your own calendar is working fine. We've tested with different Outlook versions and disabled Add-Ins.

    Workaround for users is switching to OWA or the new Outlook.

    We reported the issue over the admin center and a few hours later Microsoft marked the problem as solved "found no issues". Problem still persists.



    1 person found this answer helpful.
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  5. Hansjoerg Morandell 5 Reputation points

    we are facing exactly the same issue.

    I opened also a thread on reddit:

    and raised now a ticket to Microsoft... let's see if and how they are going to fix it

    1 person found this answer helpful.
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